text: #########################
  #                       #
  # Developer: Luis Regus #
  #                       #
  #########################
  
  
  def no_teen_sum(a, b, c):
      return fix_teen(a) + fix_teen(b) + fix_teen(c) 
  
  def fix_teen(n):
      if n >= 13 and n < 15 or n > 16 and n <= 19:
         return 0 
      return n
  